228685 has 4 divisors (see below), whose sum is σ = 274428. Its totient is φ = 182944.

The previous prime is 228677. The next prime is 228707. The reversal of 228685 is 586822.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 67081 + 161604 = 259^2 + 402^2 .

It is a cyclic number.

It is not a de Polignac number, because 228685 - 2³ = 228677 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22864 + ... + 22873.

It is an arithmetic number, because the mean of its divisors is an integer number (68607).

2²²⁸⁶⁸⁵ is an apocalyptic number.

It is an amenable number.

228685 is a deficient number, since it is larger than the sum of its proper divisors (45743).

228685 is an equidigital number, since it uses as much as digits as its factorization.

228685 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45742.

The product of its digits is 7680, while the sum is 31.

The square root of 228685 is about 478.2102048263. The cubic root of 228685 is about 61.1522667370.

The spelling of 228685 in words is "two hundred twenty-eight thousand, six hundred eighty-five".